[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/modules/presentation/PresentationAvailability.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/presentation/PresentationAvailability.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/frame/UseCounter.h"
@@ skipping 22 matching lines @@
 // static
 PresentationAvailability* PresentationAvailability::take(ScriptPromiseResolver* resolver, const KURL& url, bool value)
 {
     PresentationAvailability* presentationAvailability = new PresentationAvailability(resolver->getExecutionContext(), url, value);
     presentationAvailability->suspendIfNeeded();
     presentationAvailability->updateListening();
     return presentationAvailability;
 }
 
 PresentationAvailability::PresentationAvailability(ExecutionContext* executionContext, const KURL& url, bool value)
-    : ActiveDOMObject(executionContext)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(executionContext)
     , PageLifecycleObserver(toDocument(executionContext)->page())
     , m_url(url)
     , m_value(value)
     , m_state(State::Active)
 {
     ASSERT(executionContext->isDocument());
 }
 
 PresentationAvailability::~PresentationAvailability()
 {
@@ skipping 82 matching lines @@
 }
 
 DEFINE_TRACE(PresentationAvailability)
 {
     RefCountedGarbageCollectedEventTargetWithInlineData<PresentationAvailability>::trace(visitor);
     PageLifecycleObserver::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink